package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ReportMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import org.apache.commons.lang.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * TODO
 *
 * @Author mr.zhao
 * @Date 2025/6/3 20:45
 */
@Service
public class ReportServiceImpl implements ReportService {

	@Autowired
	private ReportMapper reportMapper;

	@Autowired
	private OrderMapper orderMapper;

	@Autowired
	private UserMapper userMapper;

	@Autowired
	private WorkspaceService workspaceService;

	/**
	 * 营业额数据统计
	 *
	 * @param begin
	 * @param end
	 * @return
	 */
	@Override
	public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
		List<LocalDate> dateList = new ArrayList<>();
		dateList.add(begin);

		while (!begin.equals(end)){
			begin = begin.plusDays(1);
			dateList.add(begin);
		}

		List<Double> turnoverList = new ArrayList<>();
		for (LocalDate date : dateList) {
			LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
			LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
			Map map = new HashMap<>();
			map.put("status", Orders.COMPLETED);
			map.put("begin",beginTime);
			map.put("end", endTime);
			Double turnover = orderMapper.sumByMap(map);
			turnover = turnover == null ? 0.0 : turnover;
			turnoverList.add(turnover);
		}

		//数据封装
		return TurnoverReportVO.builder()
				.dateList(StringUtils.join(dateList,","))
				.turnoverList(StringUtils.join(turnoverList,","))
				.build();
	}

	/**
	 * 用户数据统计
	 *
	 * @param begin
	 * @param end
	 * @return
	 */
	@Override
	public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
		List<LocalDate> dateList = new ArrayList<>();
		dateList.add(begin);

		while (!begin.equals(end)){
			begin = begin.plusDays(1);
			dateList.add(begin);
		}
		List<Integer> newUserList = new ArrayList<>(); //新增用户数
		List<Integer> totalUserList = new ArrayList<>(); //总用户数

		for (LocalDate date : dateList) {
			LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
			LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
			//新增用户数量 select count(id) from user where create_time > ? and create_time < ?
			Integer newUser = getUserCount(beginTime, endTime);
			//总用户数量 select count(id) from user where  create_time < ?
			Integer totalUser = getUserCount(null, endTime);

			newUserList.add(newUser);
			totalUserList.add(totalUser);
		}

		return UserReportVO.builder()
				.dateList(StringUtils.join(dateList,","))
				.newUserList(StringUtils.join(newUserList,","))
				.totalUserList(StringUtils.join(totalUserList,","))
				.build();
	}

	/**
	 * 根据时间区间统计用户数量
	 * @param beginTime
	 * @param endTime
	 * @return
	 */
	private Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
		Map map = new HashMap();
		map.put("begin",beginTime);
		map.put("end", endTime);
		return userMapper.countByMap(map);
	}

	/**
	 * 根据时间区间统计订单数量
	 *
	 * @param begin
	 * @param end
	 * @return
	 */
	@Override
	public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
		List<LocalDate> dateList = new ArrayList<>();
		dateList.add(begin);

		while (!begin.equals(end)){
			begin = begin.plusDays(1);
			dateList.add(begin);
		}
		//每天订单总数集合
		List<Integer> orderCountList = new ArrayList<>();
		//每天有效订单数集合
		List<Integer> validOrderCountList = new ArrayList<>();
		for (LocalDate date : dateList) {
			LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
			LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
			//查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
			Integer orderCount = getOrderCount(beginTime, endTime, null);

			//查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
			Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

			orderCountList.add(orderCount);
			validOrderCountList.add(validOrderCount);
		}

		//时间区间内的总订单数
		Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
		//时间区间内的总有效订单数
		Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
		//订单完成率
		Double orderCompletionRate = 0.0;
		if(totalOrderCount != 0){
			orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
		}
		return OrderReportVO.builder()
				.dateList(StringUtils.join(dateList, ","))
				.orderCountList(StringUtils.join(orderCountList, ","))
				.validOrderCountList(StringUtils.join(validOrderCountList, ","))
				.totalOrderCount(totalOrderCount)
				.validOrderCount(validOrderCount)
				.orderCompletionRate(orderCompletionRate)
				.build();
	}

	/**
	 * 根据时间区间统计指定状态的订单数量
	 * @param beginTime
	 * @param endTime
	 * @param status
	 * @return
	 */
	private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
		Map map = new HashMap();
		map.put("status", status);
		map.put("begin",beginTime);
		map.put("end", endTime);
		return orderMapper.countByMap(map);
	}

	/**
	 * 查询指定时间区间内的销量排名top10
	 *
	 * @param begin
	 * @param end
	 * @return
	 */
	@Override
	public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
		LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
		LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
		List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

		String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()),",");
		String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()),",");

		return SalesTop10ReportVO.builder()
				.nameList(nameList)
				.numberList(numberList)
				.build();
	}

	/**导出近30天的运营数据报表
	 * @param response
	 **/
	public void exportBusinessData(HttpServletResponse response) {
		LocalDate begin = LocalDate.now().minusDays(30);
		LocalDate end = LocalDate.now().minusDays(1);
		//查询概览运营数据，提供给Excel模板文件
		BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(begin,LocalTime.MIN), LocalDateTime.of(end, LocalTime.MAX));
		InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
		try {
			//基于提供好的模板文件创建一个新的Excel表格对象
			XSSFWorkbook excel = new XSSFWorkbook(inputStream);
			//获得Excel文件中的一个Sheet页
			XSSFSheet sheet = excel.getSheet("Sheet1");

			sheet.getRow(1).getCell(1).setCellValue("时间: " + begin + "至" + end);
			//获得第4行
			XSSFRow row = sheet.getRow(3);
			//获取单元格
			row.getCell(2).setCellValue(businessData.getTurnover());
			row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
			row.getCell(6).setCellValue(businessData.getNewUsers());
			row = sheet.getRow(4);
			row.getCell(2).setCellValue(businessData.getValidOrderCount());
			row.getCell(4).setCellValue(businessData.getUnitPrice());
			for (int i = 0; i < 30; i++) {
				LocalDate date = begin.plusDays(i);
				//准备明细数据
				businessData = workspaceService.getBusinessData(LocalDateTime.of(date,LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));
				row = sheet.getRow(7 + i);
				row.getCell(1).setCellValue(date.toString());
				row.getCell(2).setCellValue(businessData.getTurnover());
				row.getCell(3).setCellValue(businessData.getValidOrderCount());
				row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
				row.getCell(5).setCellValue(businessData.getUnitPrice());
				row.getCell(6).setCellValue(businessData.getNewUsers());
			}
			//通过输出流将文件下载到客户端浏览器中
			ServletOutputStream out = response.getOutputStream();
			excel.write(out);
			//关闭资源
			out.flush();
			out.close();
			excel.close();

		}catch (IOException e){
			e.printStackTrace();
		}
	}
}
